Centec 2b y axis

[jason evansParticipant @jasonevans10206]

Hi guys

sorry got another question. Has anyone got pics of the Y axis lead screw setup on a centec mill.

would like to see my options for changing to ball screw before I start tearing it down.

thanks

jay

[jason evansParticipant @jasonevans10206]

[duncan webster 1Participant @duncanwebster1]

The screw is very close to the underside of the table, I doubt you would get a ball screw nut in. The bronze nut isn't a full nut even. I'm happy to be proved wrong

[Dave HalfordParticipant @davehalford22513]

Its in full view under the table on the righthand side and only held on by the big nut.

[not done it yetParticipant @notdoneityet]

My y axis nut is dead central and hidden from view.

[duncan webster 1Participant @duncanwebster1]

Posted by duncan webster on 02/03/2021 17:31:14:

The screw is very close to the underside of the table, I doubt you would get a ball screw nut in. The bronze nut isn't a full nut even. I'm happy to be proved wrong

Doh! I was referring to the x axis nut, never seen the y

[Gary WoodingParticipant @garywooding25363]

I've never taken it out, but here's a photo of my Y-axis leadscrew nut. The clearance round the nut seems promising.

[jason evansParticipant @jasonevans10206]

cheers. there does seem a bit of room in there. is the brass nut just a push fit in the hole it locates in. cant imagine it is rigid.

[Gary WoodingParticipant @garywooding25363]

Posted by jason evans on 03/03/2021 12:50:17:

cheers. there does seem a bit of room in there. is the brass nut just a push fit in the hole it locates in. cant imagine it is rigid.

I really don't know.

[T.BParticipant @t-b-2]

I ended up making a new screw and nut for the Y axis when I refurbished my Centec 2B.

I was too tight to make the whole nut from bronze so pressed a piece into a steel body.

From memory the original nut was a light press fit in the knee casting 

Edited By T.B on 03/03/2021 15:51:10

Edited By T.B on 03/03/2021 15:53:08

Edited By T.B on 03/03/2021 17:17:30

[jason evansParticipant @jasonevans10206]

Excellent thanks for the pics. Just what I needed 👍🏻

[Mark Williams 14Participant @markwilliams14]

I have fitted ballscrews to my Centec 2b ,x and y axis. No problem, tight squeeze on the y though.

regards

Mark

[duncan webster 1Participant @duncanwebster1]

Mark, do you have any photos or other details? Not something I'm planning in in the near future, but if I ever do it copying yours would be a good start.

[Mark Williams 14Participant @markwilliams14]

Duncan,

I am away from home for possibly another two months, so I can take pics then when I get back. From memory I joined a ballscrew to a stub shaft to replicate the original screw and made an adaptor for the ball nut to screw onto that fitted into the casting like the original nut did, I also added needle bearing thrust washers to the stub shaft. I had to space out the mounting flange casting from the y casting by 10mm to get it all to fit. I have a feeling I lost a small amount of y travel but not much. My ballscrew nut had a threaded end on it not a flange type like most seem to be so I think that made it easier.

regards

Mark

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